Knife block



FIG. 1 is a perspective view of a knife block according to the new design;

FIG. 2 is a front view of the knife block shown in FIG. 1, the rear view being identical thereto;

FIG. 3 is a side elevation view of one side of the knife block shown in FIG. 1, the other side view being identical thereto; and,

FIG. 4 is a top view of the knife block shown in FIG. 1.

Features shown in broken lines form no part of the claimed design. 

What is claimed is the ornamental design for a knife block, as shown and described. 